La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Wing length and undertail covert markings in the Skylark Alauda arvensis: A museum perspective
Auteurs :	T. W. Dougall, Auteur
Type de document :	Article
Dans :	Ringing & Migration (19(2) Nov., 1998)
Article en page(s) :	86-90
Résumé :	A museum study of skins has provided support for Dougall's (1997) field study at Musselburgh, which resulted in separation of Skylark sexes by live winglength (ltoreq109 mm for females and gtoreq 112 mm for males). It has emerged that there may be some short-winged mates in the population. For each sex, the proportion of birds caught at Musselburgh which exhibited undertail covert (UTC) markings was significantly higher than for birds collected from elsewhere within the British Isles. The reason for this is not known, but it may be a random local phenomenon, particularly where females are concerned (no female out of 25 from south of 55degreeN showed any UTC markings). UTC markings are not suitable as an ageing feature for the Skylark.

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